Choosing the right suitcase size depends on your trip length, destination, and packing style. For weekend getaways or short trips, a carry-on (around 55x40x20 cm) works well. Medium-sized suitcases (60x40x25 cm to 70x50x30 cm) are perfect for trips up to a week, while large suitcases (75x50x30 cm or bigger) are ideal for longer stays or when traveling to colder destinations. Consider your packing habits—minimalist packers may need less space, while those who pack for all occasions may require more. Always check airline baggage regulations to avoid extra fees. Find out more in our guide to choosing the right size suitcase.

The maximum suitcase size for flights is typically determined by "Maximum Linear Dimensions," which is around 158 cm (62 inches) for most airlines. However, airlines often focus more on the weight than the size of the suitcase. Most airlines allow a maximum weight of 23 kilograms (50 pounds), and exceeding this can lead to extra charges. While size is a consideration, keeping your suitcase's weight within the airline's limit is key to avoiding additional fees and hassle during your trip.

To measure a suitcase's capacity, you'll need to calculate the volume of the main compartment by multiplying its height, width, and depth. For example, if a suitcase measures 50.8 cm x 35.6 cm x 20.3 cm, you multiply these dimensions to get the volume in cubic centimetres:

50.8 cm x 35.6 cm x 20.3 cm = 36,059 cubic centimetres.

To convert this to litres, divide the result by 1,000:

36,059 cubic centimetres / 1,000 = 36.059 litres.

This gives you the suitcase's capacity in litres, helping you estimate how much it can hold.

When traveling domestically within Australia, each airline has specific carry-on luggage policies. Most airlines allow one cabin bag and one personal item, with weight limits varying between economy and business class. Qantas and Virgin Australia offer higher weight allowances for business class, while budget carriers like Jetstar and Rex are stricter about weight limits. If your bag exceeds the weight limit, you may be required to check it in for an additional fee. Personal items, such as a handbag, laptop bag, or small backpack, are generally permitted as long as they fit under the seat in front of you. See our guide to domestic carry-on limits.